Taylor Swift and Her Squad Take Over Las Vegas Club for Birthday Celebration DJ'd by Calvin Harris

Friends, family, and a really talented boyfriend – what else does Taylor Swift need for a great Friday night?

The pop star, 26, hit up Caesars Palace’s OMNIA Nightclub, in Las Vegas, alongside Karlie Kloss, to celebrate the 21st birthday of Kloss’ twin sisters, Kimberly and Kariann. They were joined by Swift’s younger brother, Austin, and several members of Haim.